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Taylor, Harry Leonard. [Author]; Cole, Charles J. [Author]; Hardy, Laurence M. [Author]; Dessauer, Herbert C. [Author]; Townsend, Carol R. [Author]; Walker, James M. (James Martin) [Author]; Cordes, James E. [Author]

Natural hybridization between the teiid lizards Cnemidophorus tesselatus (parthenogenetic) and C. tigris marmoratus (bisexual) : assessment of evolutionary alternatives. American Museum novitates ; no. 3345 ; Hybridization between teiid lizards

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  • Media type: Text; E-Book
  • Title: Natural hybridization between the teiid lizards Cnemidophorus tesselatus (parthenogenetic) and C. tigris marmoratus (bisexual) : assessment of evolutionary alternatives. American Museum novitates ; no. 3345 ; Hybridization between teiid lizards
  • Contributor: Taylor, Harry Leonard. [Author]; Cole, Charles J. [Author]; Hardy, Laurence M. [Author]; Dessauer, Herbert C. [Author]; Townsend, Carol R. [Author]; Walker, James M. (James Martin) [Author]; Cordes, James E. [Author]
  • Published: New York, NY : American Museum of Natural History, 2001
  • Extent: 3235405 bytes
  • Language: English
  • Keywords: Lizards -- New Mexico -- Chaves County ; Reptiles -- New Mexico -- Chaves County ; Cnemidophorus tigris marmoratus ; Hybridization ; Lizards -- Speciation -- New Mexico -- Chaves County ; QL1 .A436 no.3345 2001 ; Cnemidophorus -- Speciation -- New Mexico -- Chaves County ; Reptiles -- Speciation -- New Mexico -- Chaves County ; Parthenogenesis in animals ; Cnemidophorus tesselatus
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  • Description: 64 p. : ill. (some col.) ; 26 cm. ; Includes bibliographical references (p. 58-63). ; Annual hybridization is taking place between representatives of the parthenogenetic lizard Cnemidophorus tesselatus (2n = 46, 47) and males of the bisexual species C. tigris marmoratus (2n = 46) in desert grassland habitats at Arroyo del Macho, Chaves County, New Mexico. This raises the question of whether a new triploid parthenogenetic species may be originating as a consequence of this activity. Hybrids were collected in each of four years (1996-1999), and 20 of 21 hybrids collected (12 males and 8 females) were available for study. Although a triploid parthenogenetic species (Cnemidophorus exsanguis, 3n = 69) and a diploid bisexual species (C. inornatus, 2n = 46) were also found at the hybridization site, the genealogy of the hybrids was determined unequivocally with karyotypic and electrophoretic evidence (34 loci tested). The specimens examined electrophoretically included an adult female and one of her laboratory-reared daughters, which demonstrated for the first time clonal inheritance in C. tesselatus pattern class E. The population of C. tesselatus at Arroyo del Macho is characterized by two karyotypic cytotypes. The ancestral one (2n = 46) occurs at about half the frequency of the derived cytotype (2n = 47), which apparently was produced by centric fission of the ancestral X-chromosome from C. tigris. In contrast, the occurrence of the two cytotypes was reversed and strongly asymmetrical in the hybrids; only one of nine hybrids possessed the fissioned X-chromosome. This individual was significantly different in 12 meristic characters from the sample of hybrids with intact X-chromosomes. Predictably, principal components scores for this individual fell outside the 95% confidence ellipse of scores of the other eight hybrids that were karyotyped. The skewed ratio and multiple phenotypic differences suggest that hybrids inheriting a fissioned X-chromosome might be at a selective disadvantage compared to hybrids with ...